Abstract
Under decarbonization regulations by the International Maritime Organization, the shipping industry is working to develop post-LNG fuels. Among them, the possibility of using ammonia lead is emerging due to its technical advantages. In this study, structural integrity assessment and optimization were conducted when ammonia was shipped to the existing LNG tank. As a result, it was not safe due to higher mechanical stress. In order to verify this, linear and high cycle fatigue analysis were performed when liquified ammonia with a relatively high density to LNG was shipped. It was evaluated based on the safety evaluation criteria of the IGC code, and the optimization was conducted by applying the design of experiments method. The results of this study can be used to design fuel tanks using liquefied ammonia and LNG composite, providing insight to secure structural robustness of the fuel tank.
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